All Things Mk5 > Mk5 General Area
Shakey Cold Start
OllieVRS:
--- Quote from: pudding on December 01, 2023, 09:50:57 pm ---I usually am the bearer of bad news aren't I? I do try to be positive as no one wants a big bill, but in this case the cam is unhappy I'm afraid! Take him out and buy him a drink to cheer him up, poor thing, he's had a hard life!
Yeah if it's holding back with heavy throttle inputs in the mid rpms, it's lean. That's when the engine demands the most fuel. You only need to wear the cam down 0.5mm to start screwing with the fuelling. With all that wear on the follower and cam, it could be as much as 1mm short in pump lift. I think the pump lift is only about 5mm or so with a healthy cam, so it's a pretty tight margin.
Neglect definitely doesn't help unfortunately!
You could pop a used S3 intake cam in there in the meantime which has a touch more pump lift than the GTI/ED30 cam.
--- End quote ---
Looking at my options, would you by any change have the part number for both the GTI and S3 cams? I saw a video on youtube of a 'Golf R' cam install, does this mean installing the cam from the MK6 R?
Also for this job does the timing belt gear on the exhaust cam need to be removed if just changing the intake cam?
I'm considering just doing the cam in the coming months rather than a full rebuild like I previously mentioned, but I need to weigh in my options. There is a lot of potential for things to go wrong with a job like this, like poor @dazza has been having.
dazza:
Don't let my troubles put you off. My engine was completely foobared, it runs fine and the wife is using it for the school run :driver:.
OldGTI:
Shoddy service history as well as a history of low oil pressure makes me think you should also be thinking about getting the oil pick up cleaned.
BTW: So happy Pudding is still about, I have never needed him on here but it makes me feel better running about in my old gti knowing he is around. Kinda like the AA does.
breeze:
If it is a K03 GTI you can probably get away with replacing the follower and fitting HPFP internals. Not the ideal solution but fast and easy to do at home. Then just monitor the cam follower.
Alternatively, new cam is a good time to do cam belt and cam timing chain.
Edit: BWA engine so I guess the same applies. Definitely fuel cuts.
OllieVRS:
Thanks for the replies guys.
--- Quote from: OldGTI on January 15, 2024, 06:22:40 pm ---Shoddy service history as well as a history of low oil pressure makes me think you should also be thinking about getting the oil pick up cleaned.
BTW: So happy Pudding is still about, I have never needed him on here but it makes me feel better running about in my old gti knowing he is around. Kinda like the AA does.
--- End quote ---
Appreciate the tip but everything on that end has been sorted. Not only was the pick-up change twice, but the oil spray jets (aka oil squirters) and even the connecting rod bearings have been changed too.
Always a joy to see Pudding on here :smiley:
--- Quote from: breeze on January 16, 2024, 09:17:43 pm ---If it is a K03 GTI you can probably get away with replacing the follower and fitting HPFP internals. Not the ideal solution but fast and easy to do at home. Then just monitor the cam follower.
Alternatively, new cam is a good time to do cam belt and cam timing chain.
Edit: BWA engine so I guess the same applies. Definitely fuel cuts.
--- End quote ---
She's a vRS that prefers to identify as a GTI, in a country where 95% of our sporty Octavias are diesels :grin:
Would HPFP internals alleviate the fuelling issue, at least temporarily? Not to keen on them, considering their hefty price tag.
Unfortunately only did the cam chain last year. But timing belt's on three years. Would changing the intake cam even give you any advantage when doing the timing belt? I don't think I have to remove the exhaust cam for the intake cam right?
Cheers
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